I remember a truck loaded with chickens out behind a service station in a small town I used to live in. They were trying to change a tire and they had to make a cardboard roof over the tire because the eggs were just flying out of the truck and frying on the pavement. Those poor chickens were stacked I don't know how many high in wire crates on the back of a flatbed. I wouldn't be surprised if there weren't a lot of germs and bacteria in the air.